org.apache.jackrabbit.oak.query.facet.FacetResult Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.jackrabbit.oak.query.facet;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import javax.jcr.Value;
import javax.jcr.query.QueryResult;
import javax.jcr.query.Row;
import javax.jcr.query.RowIterator;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.jackrabbit.oak.commons.json.JsopReader;
import org.apache.jackrabbit.oak.commons.json.JsopTokenizer;
import org.apache.jackrabbit.oak.spi.query.QueryConstants;
/**
* A facet result is a wrapper for {@link javax.jcr.query.QueryResult} capable of returning information about facets
* stored in the query result {@link javax.jcr.query.Row}s.
*/
public class FacetResult {
private final Map> perDimFacets = new HashMap>();
public FacetResult(QueryResult queryResult) {
try {
RowIterator rows = queryResult.getRows();
if (rows.hasNext()) {
Row row = rows.nextRow();
for (String column : queryResult.getColumnNames()) {
if (column.startsWith(QueryConstants.REP_FACET)) {
String dimension = column.substring(QueryConstants.REP_FACET.length() + 1, column.length() - 1);
Value value = row.getValue(column);
if (value != null) {
String jsonFacetString = value.getString();
parseJson(dimension, jsonFacetString);
}
}
}
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private void parseJson(String dimension, String jsonFacetString) {
JsopTokenizer jsopTokenizer = new JsopTokenizer(jsonFacetString);
List facets = new LinkedList();
int c;
String label = null;
int count;
while ((c = jsopTokenizer.read()) != JsopReader.END) {
if (JsopReader.STRING == c) {
label = jsopTokenizer.getEscapedToken();
} else if (JsopReader.NUMBER == c) {
count = Integer.parseInt(jsopTokenizer.getEscapedToken());
if (label != null) {
facets.add(new Facet(label, count));
}
label = null;
}
}
perDimFacets.put(dimension, facets);
}
@Nonnull
public Set getDimensions() {
return perDimFacets.keySet();
}
@CheckForNull
public List getFacets(@Nonnull String dimension) {
return perDimFacets.get(dimension);
}
/**
* A query result facet, composed by its label and count.
*/
public static class Facet {
private final String label;
private final int count;
private Facet(String label, int count) {
this.label = label;
this.count = count;
}
/**
* get the facet label
* @return a label
*/
@Nonnull
public String getLabel() {
return label;
}
/**
* get the facet count
* @return an integer
*/
public int getCount() {
return count;
}
}
}